Seat back



FIG. 1 is a perspective view of a seat back in accordance with the teachings of the present invention;

FIG. 2 is a left side elevational view thereof, the right side elevational view being the mirror image of that shown;

FIG. 3 is a front side elevational view thereof;

FIG. 4 is a rear side elevational thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a perspective view of the device of FIGS. 1 through 5 shown attached to a wheeled device shown in broken lines and which forms no part of the claimed design. 

The ornamental design for a seat back, as shown and described. 